Power storage device packaging material and power storage device using the same

Abstract

A power storage device packaging material of the present disclosure includes: a laminate at least including a substrate layer, a barrier layer, and a sealant layer, which are disposed in this order; and an adhesive layer interposed between the substrate layer and the barrier layer, the adhesive layer containing a polyurethane-based compound made of a reaction product of at least one polyester polyol resin and at least one polyfunctional isocyanate compound, wherein the polyfunctional isocyanate compound contains an isocyanurate of isophorone diisocyanate, and a content of isocyanate groups derived from the isocyanurate of isophorone diisocyanate in the polyfunctional isocyanate compound is 5 mol % to 100 mol % relative to a total amount of isocyanate groups contained in the polyfunctional isocyanate compound of 100 mol %.

What is claimed is: 
     
         1 . A power storage device packaging material, comprising:
 a laminate at least including a substrate layer, a barrier layer, and a sealant layer, which are disposed in this order; and   an adhesive layer interposed between the substrate layer and the barrier layer, the adhesive layer containing a polyurethane-based compound made of a reaction product of at least one polyester polyol resin and at least one polyfunctional isocyanate compound, wherein   the polyfunctional isocyanate compound contains an isocyanurate of isophorone diisocyanate, and   a content of isocyanate groups derived from the isocyanurate of isophorone diisocyanate in the polyfunctional isocyanate compound is 5 mol % to 100 mol % relative to a total amount of isocyanate groups contained in the polyfunctional isocyanate compound of 100 mol %.   
     
     
         2 . The power storage device packaging material of  claim 1 , wherein a ratio of a number of isocyanate groups contained in the polyfunctional isocyanate compound to a number of hydroxyl groups contained in the polyester polyol resin is 2 to 60. 
     
     
         3 . The power storage device packaging material of  claim 1 , wherein the polyfunctional isocyanate compound further contains an adduct of tolylene diisocyanate. 
     
     
         4 . The power storage device packaging material of  claim 3 , wherein a ratio of a number of isocyanate groups derived from the isocyanurate of isophorone diisocyanate to a number of isocyanate groups derived from the adduct of tolylene diisocyanate contained in the polyfunctional isocyanate compound is 0.05 to 20. 
     
     
         5 . The power storage device packaging material of  claim 1 , wherein a mass per unit area of the adhesive layer is 2.0 g/m 2  to 6.0 g/m 2 . 
     
     
         6 . The power storage device packaging material of  claim 1 , wherein an anticorrosion treatment layer is provided on one or both surfaces of the barrier layer. 
     
     
         7 . A power storage device packaging material, comprising:
 a laminate at least including a substrate layer, a first adhesive layer, a barrier layer, a second adhesive layer, and a sealant layer, which are disposed in this order, wherein,   when the first adhesive layer is exposed by removing the substrate layer to measure an outermost surface of the exposed first adhesive layer using attenuated total reflection-Fourier transform infrared spectroscopy, a baseline transmittance T0, a minimum transmittance T1 in a range of 2100 cm −1  to 2400 cm −1 , and a minimum transmittance T2 in a range of 1670 cm −1  to 1700 cm −1  satisfy a relationship of 0.06≤(T0−T1)/(T0−T2)≤0.4.   
     
     
         8 . The power storage device packaging material of  claim 7 , wherein the first adhesive layer contains a polyfunctional isocyanate compound, and the polyfunctional isocyanate compound is composed of at least one polyfunctional isocyanate compound selected from the group consisting of an alicyclic isocyanate polymer and an isocyanate polymer containing an aromatic ring in a molecular structure. 
     
     
         9 . The power storage device packaging material of  claim 8 , wherein the first adhesive layer contains a urethane resin made of at least one polyol selected from the group consisting of polyester polyol, acrylic polyol and polycarbonate diol, and the polyfunctional isocyanate compound. 
     
     
         10 . The power storage device packaging material of  claim 9 , wherein a ratio of a number of isocyanate groups contained in the polyfunctional isocyanate polymer to a number of hydroxyl groups contained in the polyol is 5 to 60. 
     
     
         11 . The power storage device packaging material of  claim 9 , wherein a dry coating weight of the urethane resin is 2.0 g/m 2  or more and 6.0 g/m 2  or less. 
     
     
         12 . The power storage device packaging material of  claim 7 , wherein the barrier layer is an aluminum foil. 
     
     
         13 . The power storage device packaging material of  claim 7 , wherein the barrier layer has a thickness of 15 μm to 100 μm. 
     
     
         14 . The power storage device packaging material of  claim 7 , wherein the barrier layer is provided with an anticorrosion treatment layer, the anticorrosion treatment layer is provided either between the first adhesive layer and the barrier layer or between the second adhesive layer and the barrier layer, or both thereof. 
     
     
         15 . The power storage device packaging material of  claim 1 , wherein the substrate layer is made of a polyamide film or a polyester-based film. 
     
     
         16 . A power storage device packaging material comprising:
 a laminate at least including a substrate layer, a barrier layer, and a sealant layer, which are disposed in this order; and   an adhesive layer interposed between the substrate layer and the barrier layer, the adhesive layer containing a polyurethane-based compound and a polyamide-imide resin.   
     
     
         17 . The power storage device packaging material of  claim 16 , wherein a solid content (A) of the polyamide-imide resin to a solid content of the polyurethane-based compound in the adhesive layer is 1.0 mass %<A<20.0 mass %. 
     
     
         18 . The power storage device packaging material of  claim 16 , wherein the polyamide-imide resin has a number average molecular weight (Mn) of 3,000<Mn<36,000. 
     
     
         19 . The power storage device packaging material of  claim 16 , wherein the polyurethane-based compound is made of a reaction product of at least one polyol resin and at least one polyfunctional isocyanate compound. 
     
     
         20 . The power storage device packaging material of  claim 19 , wherein the polyol resin is at least one polyol resin selected from the group consisting of polyester polyol, acrylic polyol and polycarbonate polyol. 
     
     
         21 . The power storage device packaging material of  claim 19 , wherein the polyfunctional isocyanate compound is at least one isocyanate polymer selected from the group consisting of an alicyclic isocyanate polymer and an isocyanate polymer containing an aromatic ring in a molecular structure. 
     
     
         22 . The power storage device packaging material of  claim 19 , wherein a ratio (NCO/OH) of a number of isocyanate groups contained in the polyfunctional isocyanate compound to a number of hydroxyl groups contained in the polyol resin is 1.5<NCO/OH<40.0. 
     
     
         23 . A power storage device comprising:
 a power storage device main body;   a current extraction terminal extending from the power storage device main body; and   the power storage device packaging material of  claim 1 , the power storage device packaging material sandwiching and holding the current extraction terminal and accommodating the power storage device main body.   
     
     
         24 . A power storage device packaging material comprising:
 a laminate structure including   a substrate layer,   a first adhesive layer,   a barrier layer,   a second adhesive layer, and   a sealant layer, which are disposed in this order, wherein   at least one of the first adhesive layer and the second adhesive layer contains a urea-based compound which is a reaction product of an amine-based resin and a polyisocyanate compound, and,   when an infrared absorption spectrum peak intensity in a range of 1680 cm −1  to 1720 cm −1  is A1 and an infrared absorption spectrum peak intensity in a range of 1590 cm −1  to 1640 cm −1  is B1 in a layer containing the urea-based compound among the first adhesive layer and the second adhesive layer, X1 defined by the following formula (1-A) is 10 to 99:
     X 1={ B 1/( A 1+ B 1)}×100  (1-A).
 
   
     
     
         25 . The packaging material of  claim 24 , wherein an isocyanate group of the polyisocyanate compound is bonded to a blocking agent. 
     
     
         26 . The packaging material of  claim 25 , wherein the blocking agent is dissociated from an isocyanate group of the polyisocyanate compound at 60° C. to 120° C. 
     
     
         27 . The packaging material of  claim 24 , further comprising an anticorrosion treatment layer disposed at least between the second adhesive layer and the barrier layer. 
     
     
         28 . The packaging material of  claim 24 , wherein only the second adhesive layer among the first adhesive layer and the second adhesive layer contains the urea-based compound. 
     
     
         29 . The packaging material of  claim 24 , wherein at least one of the first adhesive layer and the second adhesive layer contains a hydrogen sulfide adsorbent. 
     
     
         30 . A power storage device packaging material comprising:
 a laminate structure including   a substrate layer,   a first adhesive layer,   a metal foil layer,   a second adhesive layer, and   a sealant layer, which are disposed in this order, wherein   the first adhesive layer and the second adhesive layer contain a urethane-based compound which is a reaction product of a polyol-based resin and a polyisocyanate compound, and,   when an infrared absorption spectrum peak intensity in a range of 2250 cm −1  to 2290 cm −1  is A2 and an infrared absorption spectrum peak intensity in a range of 1680 cm −1  to 1720 cm −1  is B2 in the first adhesive layer and the second adhesive layer, X2 defined by the following formula (1-B) is 10 to 90, and a glass transition temperature of the first adhesive layer and the second adhesive layer is 60° C. to 80° C.:
     X 2={ B 2/( A 2+ B 2)}×100  (1-B).
 
   
     
     
         31 . The packaging material of  claim 30 , wherein the polyol-based resin is a polyester polyol-based resin. 
     
     
         32 . The packaging material of  claim 30 , further comprising an anticorrosion treatment layer disposed at least between the second adhesive layer and the metal foil layer. 
     
     
         33 . The packaging material of  claim 30 , wherein the polyisocyanate compound contains an aromatic polyisocyanate compound. 
     
     
         34 . The packaging material of  claim 30 , wherein the polyisocyanate compound contains an adduct of an aromatic polyisocyanate compound. 
     
     
         35 . The packaging material of  claim 30 , wherein at least the second adhesive layer contains a hydrogen sulfide adsorbent. 
     
     
         36 . The packaging material of  claim 24 , wherein the sealant layer contains at least one of a polyolefin-based resin and a polyester-based resin. 
     
     
         37 . The packaging material of any one of  claim 24 , wherein the sealant layer contains a polyester-based resin. 
     
     
         38 . The packaging material of  claim 1 , wherein the packaging material is for use with a fully solid-state battery.